doublegapadj.双火花间隙的doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double- sealed双重密封double covalence双共价double arm robot双臂式机扑double underlinen.双下划线double bank type双排式Double genitalia双生殖道double frequence(二)倍频率、双频率double unit face对拉工作面double precisionadj.双倍精度的double recessive双隐性性状